This is a common mistake, I used to do this in my early days aswell. When you talk to a girl briefly and start making out with her, or you just approach and do it, it shows that you're sexually attracted to each other and because of this, her friends would assume (and rightly so) that you guys just want to hook up - it's fine if you take her home that night because "she was drinking and wasn't thinking straight" or "one thing led to another". However, if you don't do that and plan to meet up some other time then they will think less of her because she is actually planning to meet a guy she randomly made out with. That makes sense, right? You have to put yourself in her shoes and understand how girls think... her friends will think she wants to meet you just so she can fuck you, and when that sort of encounter is prearranged outside the context of a boy/girlfriend relationship it is seen as slutty. The way her friends see it is, if you organise to meet again after making out with her, the bottom line is that the meet is purely sexual because you have no respect for her otherwise you wouldn't have made out with her so soon. And that's a lesson in chick logic for you.
So, that explains why she gave you a fake email address. Email is very impersonal anyway, you should get her number so you can call her in future. I've made out with girls on the dance floor as soon as I approached, and later gotten their numbers because I couldn't bring them home that night - of course, when I called them they'd flake because of anti-slut defense/buyers remorse. There are two solutions to this problem - knowing your logistics is imperative to your success. Firstly, if it isn't possible to bring her home, don't make out with her. Pretty simple. That way, her ASD won't be kicked into action and she won't have any hangups about meeting you again. Secondly, if she's alone or with a group of friends and you know she isn't tied to one of them (ie. is sharing a taxi with a particular girl later), make sure to take her home. If it's just 2 girls, forget about it unless you know they're both into you. They will stick together nomatter what and the obstacle will almost always get the better of her. However, this isn't always the case because sometimes they will both be into you - this is a double edged sword though. On the one hand, the obstacle may be happy for her friend to get with you because she'll expect you to stay in touch and she can muscle in on you aswell. However, if this is not the case she may be jealous and stand in the way if she feels like you're getting somewhere. As long as you keep the obstacle sweet and flirt with her a little aswell, you can avoid that happening - and if she's hot aswell, talk about a fucking bonus.
